Scattering of 5–15 MeV protons from Be9

doi:10.1016/0029-5582(64)90145-2

Nuclear Physics

Volume 55, June–July 1964, Pages 265-272

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Abstract

In this study of proton scattering from Be⁹, solid state detectors were used to measure angular distributions of the cross sections for elastic scattering and inelastic scattering to the 2.43 MeV excited state. These distributions were measured at eleven bombarding energies between 5 and 15.1 MeV and cover the range from 15° to 170° in the c.m. system. The total cross section for scattering to the excited state shows a small maximum at 8 and 9 MeV bombarding energy.

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Cited by (21)

Measurements of σ(θ) and A<inf>y</inf>(θ) for the 9Be(p, n)9B reaction and lane model analysis for the 9Be + nucleon system
1986, Nuclear Physics, Section A
Differential cross sections at 16.44 and 17.57 MeV and analyzing powers at 8.0, 9.1, 11.1, 13.5 and 15.0 MeV have been measured for the ⁹Be(p, n₀)⁹B reaction and combined with previous measurements for ⁹Be(p, p₀)⁹Be, ⁹Be(p, n₀)⁹B and ⁹Be(n, n₀)⁹Be to form the first model-complete data base for a Lane model analysis. Energy dependences of the model parameters (including Coulomb corrections) have been handled in a consistent manner. The real central part of the isovector Lane model potential exhibits no surface peaking for this nucleus. Strong evidence is found for a complex spin-orbit part of the isovector potential describing nucleon scattering from ⁹Be.
Cross-section measurement and Lane model analysis for the 9Be(p,n)9B reaction
1983, Nuclear Physics, Section A
Neutron time-of-flight techniques were used to measure the ⁹Be(p, n₀)⁹B cross section from 0° to 160°(lab) at 10 energies between 8.15 and 15.68 MeV. The data are combined with previous results below 30 MeV in a Legendre coefficient analysis to evaluate the differential and integral behavior of the ⁹Be(p,n) and ⁹Be(p, n₀)⁹B cross sections. A coupled-channels Lane analysis of cross sections and analyzing powers for (p,n) quasi-elastic scattering and (p, p) and (n, n) elastic scattering is presented and compared to previous single-channel models.
Proton scattering from 9Be between 6 and 30 MeV and the structure of 9Be
1973, Nuclear Physics, Section A
Differential cross-section excitation functions at lab scattering angles 86.9°, 120.0°, 140.0° and 160.0° were measured for ⁹Be(p, p_o)⁹Be, ⁹Be(p, p₂)⁹Be and ⁹Be(p, d₀)⁸Be at proton lab energies from 6 to 15 MeV in 100 keV steps. A broad anomaly was observed in the ⁹Be(p, p₀)⁹Be excitation functions. Differential cross-section angular distributions were measured for ⁹Be(p, p₀)⁹Be and ⁹Be(p, p₂)⁹Be at lab energies of 13.0, 14.0, 15.0, 21.35 and 30.3 MeV and for ⁹Be(p, d₀)⁸Be at 13.0, 14.0, 15.0 and 21.35 MeV. Angular distributions of polarization analysing powers for ⁹Be( $p$ ,p₀)⁹Be, ⁹Be(p, p₂)⁹Be and ⁹Be( $p$ , d₀)⁸Be were measured at 8.0, 11.0, 12.0, 13.0 and 15.0 MeV. A spherical optical-model (SOM) analysis of the elastic scattering angular distribution data from 13.0 to 30.3 MeV showed that an energy dependence of only V_R and W_s (volume real and surface imaginary depths) is sufficient to reproduce the measurements. Coupled-channels (CC) analyses were made with a quadrupole-deformed optical-model potential and strong coupling of $32^{−}$ , $52^{−}$ and $72^{−}$ levels of a $K = 32$ ground-state rotational band of ⁹Be. The ⁹Be(p, p₀)⁹Be and ⁹Be(p, p₂)⁹Be data from 13.0 to 30.3 MeV were analyzed simultaneously at each energy, varying only V_R and W_s with energy, for a potential deformation of β = 1.1. Both SOM and CC analyses indicated the same energy dependence in V_R, while W_s averaged 3.5 MeV lower in CC than in SOM, with both energy dependences consistent with previous analyses of nucleon scattering from 1p shell nuclei.
The 9Be(p, d<inf>0</inf>)8Be reaction and the BHMM theory of stripping reactions
1972, Nuclear Physics, Section A
Differential cross sections for the ⁹Be(p, d₀)⁸Be reaction have been measured in detailed angular distributions for proton energies of 5 to 11 MeV in 1 MeV steps. Both BHMM and DWBA stripping theories are used to fit the data and obtain spectroscopic factors. It is shown that the data obtained over the range of energies can be used to select a parameter set for BHMM which yields spectroscopic factors very close to those given by the shell model, and which are nearly energy independent. Also an effect probably due to a compound-nucleus resonance is observed near 8 MeV, this effect being noted with the application of both stripping theories.
Optical model analysis of 9Be(p, p<inf>0</inf>)9Be cross sections and polarizations from 6 MeV to 30 MeV
1971, Nuclear Physics, Section A
Cross-section and polarization data for proton elastic scattering from ⁹Be in the lab energy range 6 to 30 MeV and in the angular range 20° to 160° have been analyzed using an optical model potential. Good quality fits are obtained with potential parameters which vary smoothly with energy. The effects of energy-averaged compound-nucleus resonances and of quadrupole coupling on the elastic scattering are investigated. The reaction is suggested for use as a polarization monitor since it compares favourably with α(p, p)α for this purpose. Contour maps of polarization, P, and cross section times P² are given as a function of angle and energy.
Polarization of protons elastically scattered from beryllium
1970, Nuclear Physics, Section A
The polarization in proton elastic scattering from ⁹Be was measured using the polarized beam from a tandem accelerator. Angular distributions of the polarization were measured at twelve energies between 3.0 and 12.0 MeV. An optical-model analysis was performed of the present polarization measurements and previously measured cross sections. The optical model was found to reproduce the data quantitatively only for incident proton energies above 9 MeV.

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^†: This work was supported in part by the U. S. Office of Naval Research.

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Nuclear Physics

Abstract

References (10)

Phys. Rev.

Phys. Rev.

Phys. Rev.

Phys. Rev.

J. Phys. Soc. Japan

Cited by (21)

Measurements of σ(θ) and A<inf>y</inf>(θ) for the <sup>9</sup>Be(p, n)<sup>9</sup>B reaction and lane model analysis for the <sup>9</sup>Be + nucleon system

Cross-section measurement and Lane model analysis for the <sup>9</sup>Be(p,n)<sup>9</sup>B reaction

Proton scattering from <sup>9</sup>Be between 6 and 30 MeV and the structure of <sup>9</sup>Be

The <sup>9</sup>Be(p, d<inf>0</inf>)<sup>8</sup>Be reaction and the BHMM theory of stripping reactions

Optical model analysis of <sup>9</sup>Be(p, p<inf>0</inf>)<sup>9</sup>Be cross sections and polarizations from 6 MeV to 30 MeV

Polarization of protons elastically scattered from beryllium